observe vs watch over

observe and watch over both are verbs.

Word	Noun	Adjective	Verb	Adverb
observe	No	No	Yes	No
watch over	No	No	Yes	No

As verbs, observe and watch over are synonyms defined as:

Other synonyms of observe include follow, keep an eye on, watch.

observe (verb)	watch over (verb)
stick to correctly or closely	follow with the eyes or the mind
make mention of
watch attentively
observe with care or pay close attention to
discover or determine the existence, presence, or fact of by perception with the eyes
follow with the eyes or the mind
show respect towards
behave as expected during of holidays or rites
conform one's action or practice to